A transparent item of a predetermined size that permits unobstructed and undistorted view of a desired area. It may include a frame, have reference markings, grid lines and may be heat strengthened and/or tinted. It is generally used where safety, security, and/or the restriction of foreign matter are required, such as the visual examination of the inside of pressurized tanks, liquid sights, controlled liquid flow, and inspection of equipment enclosed in a housing. See window (as modified); scale, cathode ray tube; scale, plotting; window, metal; window, wood; and window panel, aircraft.
Classification: Pressed or molded glass articles, wired or not, for building or construction;leaded glass windows etc; formed multicellular or foam glass
NSN 5996-01-219-5091
NSN 6105-01-338-6249
NSN 5910-01-098-3768
NSN 6150-00-651-8743
NSN 5990-01-633-9503
NSN 6620-00-071-8778
NSN 5945-01-013-0045
NSN 6130-01-297-6047
NSN 6645-01-462-3078
NSN 6685-01-526-1671
NSN 6620-01-346-9340
NSN 5915-01-504-5746